class Date{
	public int year = 2021;
	public int month = 5;
	public int day = 10;
	
	public Date(){}
	
	public Date(int year,int month,int day){
		this.year = year;
		this.month = month;
		this.day = day;
	}
	public void printDate(){
		System.out.println(this.year + "/" + this.month + "/" + this.day);
	}
}
public class jiudichushihua{
	public static void main(String[] args){
		Date d = new Date(2023,9,7);
		d.printDate();//2023/9/7
		Date d1 = new Date();
		d1.printDate();//2021/5/10
	}
}